Steam oven



FIG. 1 is a perspective view from the front, right of steam oven showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof, with the bottom view being a mirror image thereof (with the exception of the unclaimed handle); and,

FIG. 4 is a right side view thereof, with the left side view thereof being a mirror image thereof.

The broken lines represent portions of the steam oven that do not form any part of the claimed design.

The rear of the steam oven is unornamented and unclaimed. 

The ornamental design for steam oven, as shown and described. 